Azo dye.



NTED %TATE% PATENT @EFTQE MYRTIL KAI-IN AND ANTON OSSENBECK, OFELBERFELD, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER &(30., OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

Patent-ed Sept. 28, 1909.

AZQ DYE.

935,031. Specification of Letters Patent.

No Drawing.

To all whom it may concern:

Be it known that we, Myn'rii. KAHN and ANTON OSSENBECK, doctors ofphilosophy, chemists, citizens of the German Empire, residing atElberfeld, Germany, have invented new and useful Improvements in New AzoDyes, of which the following is a specification.

Our invention relates to the manufacture and production of new coloringmatters capable of dyeing either mordanted or unmordanted wool. The newdyestufis are obtained by combining with 2 arylamino 5naphthol-7-sulfonic acids the diazo compound prepared fromdinitro-ortho-amino-metacresol (Amtalen (Zer Ohcmz'c 163 page 104).

The new dyestuffs are dark powders soluble in water with a violet color.They yield upon reduction with stannous chlorid and hydrochloric acidtriamino-meta-cresol and 2-arylamino 5 naphthol-6-amino7-sulfonic acids.They dye wool from an acid bath generally violet shades, which onchroming change to bright fast black shades.

In order to illustrate the new process more fully the following exampleis given, the parts being by weight: 21.8 parts ofdinitroortho-amino-meta-cresol well mixed with 500 parts of water of 60C. are dissolved by the addition of the neccessary quantity of ammoniaand reprecipitated again from the cooled solution by the addition of 80parts of hydrochloric acid of 19 The precipitate is then diazotized inthe usual manner by means of hydrochloric acid and 7 parts of sodiumnitrite. The diazo compound separates during the process of diazotation;it is added to an aqueous solution, which has to be stirred until thecombination is finished, of 32 parts of 2-phenylamino-5- naphthol-7-sulfonic acid in an excess of sodium carbonate. The dyestuff isfiltered off, pressed and dried. It is a dark powder soluble in waterand in concentrated sulfuric acid with a reddish-violet color. Byreduction with stannous chlorid and hydro- Application filed July 8,1909.

Serial No. 506,564.

chloric acid triamino -meta -cresol and 2- phenylainino- 5- naphthol- 6-a1nino-7-sulfonic acid are obtained. It dyes wool from acid bathsviolet shades which on being chromed. are changed to a beautifulblue-black.

The process is carried out in an analogous manner on using otherQ-arylamino-5-naphthol 7 sulfonic acids, such as 2paratolylamino-541aphthol-T-sulfonic acid orQ-orthoanisyl-amino-5-naphthol-7-sulfonic acid etc.

We claim 1. The herein described new aZo dyestuffs, obtainable fromdinitro-ortho-amino-metacresol and Q-arylamino 5-naphthol-'T-sulfonicacids, which dyestufis are, after being dried and pulverized, darkpowders soluble in water generally with a violet color; yielding uponreduction with stannous chlorid and hydrochloric acidtriainino-nieta-cresol and Q-arylamino 5 naphthol G-amino-T-sulfonicacids; dyeing wool generally violet shades which on being chromed arechanged to fast black shades, substantially as described.

2. The herein described new azo dyestufl' obtainable from diazotizeddinitro orthoamino meta cresol and 2 phenylamino 5- naphthol-7-sulfonicacid, which dyestuff is, after being dried and pulverized, a dark powdersoluble in water with a reddishviolet color and soluble in concentratedsulfuric acid with a reddish-violet color; yielding upon reduction withstannous chlorid and hydrochloric acid triamino-meta-cresol andQ-phenylarhino 5 naphthol-6-amino-7- sulfonic acid; and dyeing woolviolet shades which on being chromed are changed to black shades,substantially as described.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

MYRTIL KAHN. [n s] ANTON OSSENBECK. [n s] Witnesses O'rcro KoNio, W'ILLYKLEIN.

